In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... density of 143.0/km² (366.8/mi²). The racial makeup of the village is 95.20% White, 0.00% African American, 0.00% Native American, 2.40% Asian, 0.00% ...